Bottle cap



FIG. 1 is a perspective view showing my design;

FIG. 2 is a front view showing my design;

FIG. 3 is a back view showing my design;

FIG. 4 is a left side view showing my design;

FIG. 5 is a right side view showing my design; and,

FIG. 6 is a top plan view showing my design.

The broken lines in the drawings depict the portions of the bottle cap that form no part of the claimed design. 

CLAIM The ornamental design for a bottle cap, as shown and described. 